I think the implication is that they don’t use anything from any of those companies. I see icons for Bitwarden, Nextcloud, and Lemmy. So they’re probably a big selfhoster.
While I agree with everyone that Quicksync is the best option, a Quadro P400 is also a viable option. You can get one off eBay for around $40. It’s only 2 gigs of RAM, so you’re limited to 2 or 3 transcodes at a time. But it’s cheap and may even work in your Synology depending on what model you have.
It’ll only be a week before they kill it again.
I know it’s not quite what you asked. But if you have a little DIY ability you could build a good UPS out of a 100ah LiFePO4 battery and inverter. I’ve seen a few youtube builds where the runtime beats out what you can get out of a regular UPS. And with less maintenance.